A demonic Hashira? Unthinkable! Not possible!
Once Kaori, 20 years young, was one of the most powerful fighters against the demons - the pillars. In a careless moment, Muzan, the demon king, had finally managed to transform her into his own kind. As a result, Kaori was rejected and banished by the other pillars and also lost the love of her life - the water pillar Giyu.
Since then, she has lived in seclusion at the foot of a mountain deep in the forest, struggling to find her new self, until one day she is unexpectedly visited by one of her former comrades, who has a big and fateful request in tow.